5(6)-CFDA (full name: 5-(and-6)-Carboxyfluorescein diacetate) is membrane-permeant and thus can be loaded into cells via incubation. Once inside cells, CFDA is hydrolyzed by intracellular esterases to carboxyfluorescein.    Off-white solid soluble in DMSO  Store desiccated at 4°C  C25H16O9.  MW: 460  [124387-19-5]